Brake drum



Nov. 6 1923. I

G. WALTHER BRAKE DRUM Filed July 31. 2 Sheets-Sheet 1 Pap-99 INVENTOR.

A TTORNEYS.

Nov. 6 1923.

G. WALTHER BRAKE DRUM 2 Sheets-Sheet 2 Filed July 51, 1922 IN V EN TOR.

A TTORNEYS.

I vide a brake drum which will accomm lurure STATES,

' r gg;

GEORGE WAL'IHEB, O15 DAYTON, OHIO.

:a mum.

Application filed July 81, 1922. Serial Ito. 578,830.

To all may concern:

Beit known that I, GEORGE WALTHER, a

citizen ofthe United States, residing at .d

Dayton, in the countyofjMontgomery and State of Ohio, have inventedcertain newand useful Improvements in Brake Drums, of which thefollowing is a speclficatlon,

reference being had therein to the accompan ing drawing.

invention relates to brake drums and particularly to brake drums 1nconnection with heavy automotive equipment.

It is my object to provide a brake drum of oat strength and wearingqualitles whic shall have the minimum weight and minimum size. It is afurther object to r3;

a a pair ofinternally expanding braking mem- It is a still furtherobject to provide a brake drum of such very hard material as 15 680 andcoo erating integral members therein to fac' tats the attachment of thebrake drum to the wheel and to facilitate the manufacture of the brakedrum and to provide means for radiating heat therefrom.

It has been found that/manganese steel is the most suitable material forthis purpose but due to its great hardness it is impossible to machineit or otherwise workup-p: it except by the tedious process of grin y g.To obviate thedifliculty inherent in the material and to still secure itfor the urpose desired, for which it is particularly tted, I insert whencasting the brake drum carbon steel inserts which may be machined,drilled,

etc., in the customary manner. The carbon 1 inserts are located adjacentthe pointsof attachment and I also employ, if desired, carbon steelheatradiating s which ma be dressed and otherwise adjusted, whic would notbe the case if the fins were of manganese steel.

In the accompanying drawings;

-5 F' 1 is a section of the brake drum being I the tru on a mandrelwhile still hot;

Fi 2 is a section throu 'h a wheel and rake drum supporte thereby,takenon the line 2-2 of Fig. 4 and looking in the direction of thearrows;

'g. 3 is an end levation of the brake drum; and v Big. 4 is an elevationof the assembled brake drum and wheel looking at the asmmbly from theinside of the vehicle.

I Referring to the drawin being I in detail, 1 is a cyhndrlcal memberconstituting the brake rum of manganese steel having on the peripherythereof and inserted therein durmg cast ;g a plurality of spaced carbonsteel heat radiating fins 2'. The brake drum is provided with an angular1i or rim 13 in which, at intervals, there are ocated carbon steelinserts 4 which are drilled with apertures 5 for the insertion of the.re'tainin bolts 6. These retaining bolts are carrie v by the s okes 7of the wheel.

It wi be understood that there are a plurality of these inserts and aplurality of retaining bolts.

In producing these brake drums after casting it will be found that theyare not exactly true and in order to bring them to size while still hotI provide an ex andi'ng mandrel 8 shown in Fig. 1, upon w ich the brakedrums are placed. They. are allowed to cool upon this mandrel in itsexpanded position and. upon cooling the mandrel is collapsed and thedrum removed. This Y drum may be of any desired character.

After this operation the inner surface of the brake drum to which thebraking members will be applied is carefully The operation is possiblewith this steel ut dr1 ling or other machining. is impracticable.

In order to facilitate such an operation the carbon steel inserts 4 areprovided which ma be readlly drilled to receive the bolts 6.

he fins 2 may also be suitably dressed, if desired.

It will be noted that the brake drum provides a thin relatively lightwall of very great strength'and wear resisting u-alities.

While I have shown and descri ed certain features as constituting myinvention, it will be understood that parts have been shown for purposesof illustration onl that I ,do not desire to be limited tosuch details,as obvious modifications will occur to a person skilled in the art.

Havin thus fully described my invention,

desire to secure by round.

y, and.

qiglities, and

flange of high wear resisting, qualities, and

inserts therein of softer material, said insen-ts being located theflange thereof with apemures in sand inserts.

- 3. In a brake mechanism, flange of high wear resisting qualities, andinserts therein of softer material, said inserts being located in theflange thereof with apertures in said inserts, and a plurality of spacedradiatin fins of material difiering from the brake rum material locatedon the exterior thereof to radiate heat therefrom. a. In a brakemechanism, a manganese steel body consisting of a braking surface and asupporting Wall, carbon steel inserts in said supporting wall located atspaced intervals, said inserts being adapted to have a drum andapertures drilled therethnough for retaining bolts.

ll fu -73,386

5. In a brake mwhanism, a manganese steel body consisting of a brakingsurface and a supporting wall, carbon steel inserts in said supportingwell located at spaced intervals, said inserts being adapted to haveapertures drilled therethro h for retaining bolts, and a plurality ofardened steel radiating fins on the exterior of the braking surf-acespaced from one another to radiate heat therefrom.

6. In a brake mechanism, a ma anese steel braking surface and aplurality of hardened steel spaced inserts located on the exteriorthereof to radiate heat therefrom.

in testimony whereof I afiix my signature.

enonen Wanrnaa.

